Collapsible core



June 7, 1927. 1,631,838

' v c. H. TERRY COLLAPSIBLE CORE Filed Dec. 24. 1925 2 Sheets-Sheet l A TTORNE V 1 June 7, 1927. 1,631,838

(3. H. TERRY COLLAPSIBLE CORE 1 Filer; e0. 24, 1925 2 Sheets-Sheet 2 m f/ W A TTORNEYS.

Patented June 7, 1927.

UNITED STATES CHARLES H. TERRY, OF CINCINNATI OHIO.

COLLAPSIBLE CORE.

Application filed December 24, 1925. Serial'N0f77A55 My invention relates to devices used in the 't'orming of cavities in molded panels, and blocks of plastic material, and is collapsible in order to permit of its withdrawal from the work after the panel or block has been cast.

There have been a number of devices for a similar purpose which have been provided, and it is my object to improve on the structure same.

Essentially itis my object to provide a core in the form of hollow plates in which the side alls and edge walls, two of each. are extended and contracted into dili'erent relative positions, by the manipulation o! a single element which extends out through both open ends of the core. [t is also my object more generally to provide a structure in which all tour walls are individuab ly controllable, as well as jointly controlla bio, and in which the operating element e.\'- tends lengthwise through the whole device with interspaced means for holding the sect-ions in their desired position, so that without relation to the length of the core, it is operable to supply the required mech. anism, and so that it is as simple to withdraw and install.. In other mechanisms, such as those which rely on wedging action of some parts on others and which rely on the mere withdrawal. oi the distending means for colla fising the core, instead of positively collapsing it, there are strict limits in the length possible for the core, and it is a problem to assure a true parallelism of opposite sides. Also in other. mechanisms, it is not [)OSSllJle, so far as I am advised, to providetor side and edge pieces which are so operated by a central length wise member as to permit any one of the pieces to be given an additional adjustment by holding the lengthwise adjustable mem-- ber still, and moving the piece to be adjusted with relation to it.

In the drawings Figure 1 is a cross section of my device on the line 1-1 of Figure 3.

Figure 2 is a section taken longitudinally on the line 2-2 in Figure l showing the edge sections contracted.

Figure 3 is a like view showing the edge sections extended.

Figure 4, Figure 5, Figure 6 and Figure 7 are detail views showing the several positions of the side wall control cams, Figure 4; being taken along the line 4- 1 in Fig ure 8.

Figure 8 is a view similar to Figure 1 showin in cross section a contracted condition ot the device.

The structure may takea number of ditterent shapes, of which I have shown merelya much flattened octagon. In forming this particular design, the side walls of the structure are 't'orl'ned of metal. plates having bodies 1. and 2, and divergent terminal flanges 3, 3 and l, 4-. Held movably within the structure, which may be of any desired length within practical limits, are ed e blocks 5 and 6, which are shaped so that when extended and located, between the flanges of the side plates, the faces of the blocks will fill out the lateral edges, forming in the device shown an octagonal shaped de vice, as will be evident from an examiruition of Figure 1 and Figure 8.

Preferably I may provide a flexible covering for the side edges'o'l't the collapsible core device, by en'iploying pieces of canvas as at 7, which are secured along their edges to the hide s and extend out over the flanges of the side plates, and riveted into position by rivets 8 or any other desired means. As shown there are two folds of the canvas, one attached to one flange and one to the other. The position of the canvas will be o'l covering the joint, and protecting it from influx of plaster, and the canvas is not required when the mold is used within a, core of cardl'loard, or other substance. Hence I have shown it at but one edge in the several views noted, although in any one device. both edges will be protected by canvas, or neither oil them.

A hollow bar 9 extends lengthwise through the middle of the form, supported. as will be described, and on this bar at a plurality of locations, in a mold oi any length, will be supporting arms 10 pivoted on the bar, and pivoted to the edge blocks, as by the screws 11, shown in the drawing.

lVhen the central bar is moved length wise, the two blocks are spread as shown in Figures 2 and 3, in which the arms are in block spreading position in Figure 3, thus pushing the blocks out into a position oi filling the gaps left between the flanges ot the side plates.

Mounted in a series along each of the side plates on theinside thereof are angle plates 12, on I which are pivoted the cams 13. These cams in addition to being pivoted as at 14 to the angle platesare connected togetl'ier in pairs by a pin 15; which pas is through the lengthwise operating bar s aid bar having a suitable slotted aperture IG, in

two of its walls for thispurpose. t e As a result, When the bar is moved lengthwise ofuthfe core i't will first slide fromthe position shown in Figure 7 to the position of Figure 6, thus bringing the end oflzthe two slots against the connecting pm of the cams, for as manypairs otcamsas are employed' dependmg upon the length oi the device-H V,

the'jbarj, is continued in its movement it rocks the cams; mthe same dlrection ateaeh 1 side" to', the position shown in Figure 7,

which thrusts out the side walls of thedeviceandr holds them" in braced outer position; The bar \is then thrustfurther, as at opptisitehdirection to the extending moveinent, ;The rocking ofthe cams results 111- =the pivotcentersthereof being "drawn 'to-.v

ward .theee'nter of the common, pivot pin, in the, lengthwise bar, w'vit'hthe result of pull ing'inwardly on the angle iron brackets that are secured 'tothefside walls and on which theflcams arep1voted. Also the arms connected to the edgeblocks are brought to a small angle'which pulls inwardly, on the edge blocks,; this action taking'place before the side sections are contracted inwardly due I to the. slots in the lengthwisebarr When'the co're has been expanded, and

' any one" section thereof is 'not properlylind' up withthe others, due to loose connections or what not, the operator by tapping in'- wardlyQfrom either end of the device can ca'useithe seetiontowinove of itself with relation to the lengthwise bar; thus bringing about a change in position of the particular section in, quest-ion,with-out changing the position of the lengthwise bar or the other sections. i I

- The device is simple and quickly and" efj fectively operable, with positive movement ofparts at all points, and no chance of be coming 1amrned, and falhng to operate. In" 1ts essence a single lengthwise operating memberie'xtends the side plates and edges 'ofa collapsible eore,.of which the shape is not essential, nor the relative sizes ofthe lengthwise of the'dev-ice. I v having side portions,

side plates and edge blocks since the blocks might be of larger; area than the side plates itdesired, or vice versa. Neither are the siiy in my construction. t

T he advantages of the divergent flanges are that they permit, of a closed hollow core member bemgfm-med in various positions OfdlStGIlSlOIl, a factor not ordlnarlly of 1mportancehin the, molding ,o'fi uplastic sub stances in themanner forwhichmy inventio'nilisadaptedn.

Having thus described my invention what ,Iclann as new and desire to secure by Let ters Patent, is:-- V 3 H1. A collapsible core device having side plates and edge blocks; alengthwise movable 1 member within said core; and means within:

divergent flanges on the side plates a necesrw the core and operable by the lengthwise, f .inovable member for positively k thrusting ioutwardly' from the center ofthe core 'and drawing inwardly from expanded positionboth the edge blocksnand the side, plates)" said means comprising arms ,connected to, the lengthwise movableymember and the edge blocks, and cams mounted on theside plates and engaged by the lengthwise movable member.

Y 2.? A collapsi le core device having side plates and. edge blocks, meansiforgmoving said plates and blocks inwa'rdlyijfrom,exi pended position to reduce the-circumference.

of the core,.and flexible members se'eul'edto, the edge blocks, and entendingiout across;

the ends of the side plates to close between blocks and plates. 1

3. A collapsible core having side the joint and edge portions which abut one another at adjoining edge'silengthwiseof. the device .1

when extended a bar extendinglongitudig nallycthrough the'core means pivotedoii the core portions for supporting fsaid baij said supporting means'beingrearranged with;

cam edges to abut the coreportions on which theyrarel mounted when the bar is moved 41' A collapsible core andedge portions which abut one anotherfl at ad Omi-ng edges lGDg'tlIWJ'SGOf the device when extended, a bar extending lo'ngitudi} nally through the core, means pivoted on the core'portions for supporting said bar, said- Supporting means being arranged withheam edges to abut the core portions 011 which they are mounted when the bar is moved lengthwise of the device and arms on the bar 5 and extending to other portions ofrthe core" to extend, said portions, when thebariis: moved to rock sald plvotedv supporting} means, and to contract said core by moving the portions inwardly upon a movementof the bar in the opposite direction. 2,

CHARLES H. TERRY. 

